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Hydrogen reduction of chromium chlorides: A kinetic investigation
Author(s) -
Rigg Tyson,
Innes David B. K.
Publication year - 1968
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450460612
Subject(s) - chemistry , vaporization , activation energy , chloride , chromium , hydrogen , atmospheric temperature range , inorganic chemistry , reaction rate , reaction rate constant , analytical chemistry (journal) , kinetics , catalysis , thermodynamics , organic chemistry , physics , quantum mechanics
The reduction of single pellets of chromic and chromous chlorides by hydrogen has been studied kinetically. The reaction 2 CrCL 3 + H 2 →2 HCl + 2 CrCl 2 was investigated over the temperature range 475−615°C. The rate controlling factor in the range of 475−493°C. is vaporization of chromic chloride; the activation energy was found to be 67.8 K.cal./mole. Between S10 and 615°C, the reaction rate is evidently controlled by heat and internal mass transfer processes. In this case the apparent activation energy is 16.6 K.cal./mole. Reduction of chromous chloride, CrCl 2 + H 2 → 2 HCl + Cr , was investigated over the temperature range 675−800°C. This reaction is also controlled by heat and mass transfer and involves vaporization of the chromous chloride. The apparent activation energy is 25.5 K.cal./mole.